yesterday my ibook's battery went dead...from 100% charge to 0% instantaneously. there is no charge at all. very strange. so, i don't know if it's the battery or if it's the charging mechanism in the ibook...any way to check this other than to try another battery? also, if it is the battery, is it serviceable under applecare? the only reason i ask is b/c it doesn't seem to be normal wear (like losing some percentage of its charge) but a faulty battery (holds no charge at all). thanks.